feat(terminal): switch terminal transport to pure websocket with fallback (#762)

* feat(terminal): add resumable websocket transport

Unify terminal input and stream traffic on `/api/terminal/ws` with a v2 control-frame protocol and advertised transport capabilities.

Buffer recent PTY output on the server so rebinding clients can replay missed chunks after reconnects or startup races, while keeping SSE as a fallback stream path.

Update the web terminal client and store to negotiate the new transport, track tab lifecycle, and avoid reopening exited sessions when restoring tabs.

* fix(terminal): retry rehydrated websocket reconnects

* fix(terminal): keep reconnect retries silent

* fix(terminal): wire ws stream output and replay in runtime

* fix(web): enable ws proxy for /api in dev

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/web/server/lib/terminal/index.js

@@ -1,12 +1,31 @@
 export {
-  TERMINAL_INPUT_WS_PATH,
-  TERMINAL_INPUT_WS_CONTROL_TAG_JSON,
-  TERMINAL_INPUT_WS_MAX_PAYLOAD_BYTES,
+  TERMINAL_WS_PATH,
+  TERMINAL_WS_CONTROL_TAG_JSON,
+  TERMINAL_WS_MAX_PAYLOAD_BYTES,
+  isTerminalWsPathname,
   parseRequestPathname,
-  normalizeTerminalInputWsMessageToBuffer,
-  normalizeTerminalInputWsMessageToText,
-  readTerminalInputWsControlFrame,
-  createTerminalInputWsControlFrame,
+  normalizeTerminalWsMessageToBuffer,
+  normalizeTerminalWsMessageToText,
+  readTerminalWsControlFrame,
+  createTerminalWsControlFrame,
   pruneRebindTimestamps,
   isRebindRateLimited,
-} from './input-ws-protocol.js';
+} from './terminal-ws-protocol.js';
+
+export {
+  TERMINAL_WS_PATH as TERMINAL_INPUT_WS_PATH,
+  TERMINAL_WS_CONTROL_TAG_JSON as TERMINAL_INPUT_WS_CONTROL_TAG_JSON,
+  TERMINAL_WS_MAX_PAYLOAD_BYTES as TERMINAL_INPUT_WS_MAX_PAYLOAD_BYTES,
+  normalizeTerminalWsMessageToBuffer as normalizeTerminalInputWsMessageToBuffer,
+  normalizeTerminalWsMessageToText as normalizeTerminalInputWsMessageToText,
+  readTerminalWsControlFrame as readTerminalInputWsControlFrame,
+  createTerminalWsControlFrame as createTerminalInputWsControlFrame,
+} from './terminal-ws-protocol.js';
+
+export {
+  TERMINAL_OUTPUT_REPLAY_MAX_BYTES,
+  createTerminalOutputReplayBuffer,
+  appendTerminalOutputReplayChunk,
+  listTerminalOutputReplayChunksSince,
+  getLatestTerminalOutputReplayChunkId,
+} from './output-replay-buffer.js';